Electric coil winding machine



F. B. TURNER ELECTRIC COIL WINDING MACHINE Sept. 29, 1953 Filed May 8, 1948 3 Sheets-Sheet l Inventor MM W Atlorne y P 1953 F. B. TURNER 2,653,771

ELECTRIC COIL WINDING MACHINE Filed May 8, 1948 3 Sheets-Sheet 2 MM By M Attorney I nventor P 1953 F. B. TURNER ELECTRIC COIL WINDING MACHINE 3 Sheets-Sheet 3 Filed May 8, 1948 Attorney Patented Sept. 29, 1953 UNITED STATES PATENT OFFICE ELECTRIC COIL WINDING MACHINE Application May 8, 1948, Serial No. 25,865 In Great Britain June 13, 1947 3 Claims.

This invention relates to coil winding machines and more particularly to machines for winding wire (or tape) around annular cores, hereafter called toroidal winding machines.

According to the present invention a toroidal winding machine is provided with a carrier for the core being wound so mounted as to allow it to move a limited extent to relieve the tension on the material being wound thereon.

The carrier may be so mounted as to be moved in one direction by the tension on the material being wound, spring or gravity means being provided for restoration to its original position when the tension slackens, or the carrier may be reciprocated by gearing in such manner as to reduce tension on the Winding material almost to zero. The invention is particularly of value for winding cores with fine wires viz: from to S. W. G. to 46 S. W. G. since it avoids difiiculties hitherto experienced of breaking of such wires during winding operations.

Embodiments of the invention will now be described with reference to the accompanying drawings, in which:

Fig. 1 is a general view of one form of toroidal winding machine according to the invention.

Fig. 2 is a view of the carrier for the core in the machine of Fig. 1.

Figs. 3 and 4 show details of the machine of Fig. 1.

Fig. 5 is a vertical elevation and Fig. 6 a plan of an alternative form of carrier for the core.

Figs. 7, 8 and 9 show yet another form of carrier for the core, Fig. '7 being an elevation, Fig. 8 a plan and Fig. 9 showing details of the gearing used to reciprocate the carrier.

Referring to the drawings and first to Figs. 1 to 4 thereof, a toroidal core I to be wound with wire is mounted in a carrier 2. A spool ring 3 in the form of an annulus with a gap 4 therein is carried within a guide ring 5 of similar shape, the spool ring 3 protruding from the guide ring 5 a little at one side or" the gap i. The spool ring 3 and guide ring 5 are shown in cross section in Fig. 4.

The guide ring 5 is rotatably supported upon five rollers on sleeves B which are journalled on spindles l fixed into the machine frame 8, held by nuts 9 (Fig. 4). The spool ring 3 is held within a recess in the guide ring 5 by means of a tension spider it, a tension ring ll being interposed between the spool ring 3 and the spider it. The spider it is mounted in the frame 8 by means of a tension adjusting screw l2 (Fig. 4). A pin 53 is fixed to the frame 8 to prevent rotation of the spider I0.

The guide ring 5, carrying with it the spool ring 3, is rotated by means of friction wheels i l, driven by a friction wheel it, which in turn is driven by a motor [6. It is to be understood that toothed gearing may be used for the drive instead of friction gearing.

The wire 11, Fig. 4, being wound on the core I is drawn from the end of the spool ring 3 which is shown protruding slightly beyond the guide ring 5, passes over the latter and between the guide ring 5 and a guide rod l8. Thence it passes between a face plate l9 (Figs. 1 and 4) and a crescent shaped pressure pad 2%) which is positioned partly round the core. Leaf springs ii are located against the pad 20 by means of pins 22 on the latter. The springs 2i are fixed to a bracket 23 fastened to the base plate 24 of the machine. The springs 21 press the pad 20 against the face plate [9. More specifically, assuming that at the start of the operation the winding ring is in the position shown in Figure l, and the wire is about to be passed through the core. The winding ring carrying the spool passes through the core as shown in Figure 2 and approximately at this point a first tension will be exerted on the core by the wire; this tension is relieved by the pivotal movement of the core. The winding ring continues in its rotational path and the wire being unwound passes between the pressure pad and plate. Thus, the ring will reach another position in which a second tension is exerted on the wire; this being when the wire leaves the pressure pad and plate, and sharply hits the core. However, this tension is minimized because the spool which is frictionally maintained will slightly slip relative to the winding ring.

The guide ring 5 gives or tends to give the spool ring 3 a forward motion in the required direction due to friction between spool ring 3 and guide ring 5. Thus the only force exerted on the winding wire ll is that necessary to impart a mo mentary acceleration to the already moving spool ring 3, this acceleration being required once per turn.

During part or the rotation of the guide ring 5 more wire is pulled off the spool ring 3 than is needed to supply winding wire to the core and this excess is stored and guided by the pressure pad 20.

The carrier for the core consists of clamping jaws 25 and 26, Figs. 1 and 2. The lower jaw 26 is fixed to a body 2?, Fig. 2, mounted on a pivot 28 journalled in a pillar 29. The carrier for the core 1 is thus able to follow in the path of the wire ll to a limited extent, so that when the wire receives an initial shock when imparting accel- 3 eration to the spool ring 3 the shock is minimised as pointed out above. The extent to which the core carrier moves is limited by a spring 30 tensioned between the plate 26 and a threaded rod 3| screwing into a projection 32 on the pillar 29, a knurlednut 33 being provided to regulate the tension of therspring 36'.- An adjustable stopt i'ris provided to limit the movement of the core carrier in one direction and if desired, a stop may be provided to limit the movement in the other direction.

Electrical contacts 35 are mounted on the pillar 7 29 and opened and closed at each,,.reciprocationof the carrier l by means of a screw'or pin-3d projecting from the lower jaw 26 of the clamp.

These contacts may be used for anyoneorsnore of several difierent purposes, viz:

((1) to apply and release electrically operated brakes acting upon the spool ring 3 and/or the guide ring 5 during, winding (b) to control the operation of core traversing mechanism which couldthus be arranged to operate at a chosen instant during the application of each turn. This is of value where accurate placing of turns is required.

(0). accuratecounting of the number of turns of wireappli-ed.

In the machine shown in Figs. l to the traversing of. the core is done by hand, but mechanism fordoing this automatically is well known and it will be clear that the form of the invention" shown in these figures could be applied to such amachine.

Figs. 5 and 6 show a form of carrier for the core mounted so as to move in. a curved path. Thecore l is clamped .between jaws and 26 as in the preceding figures, but the lower jaw 26 is bent as shown and mounted on a pivot on a carriage t? carryingrollers tdrunning on curved tracks 39 mounted in brackets it, ti on the machin base. There are, three rollers Iiilrunning on each track 39 but in Fig. 6, one of the rollers on each track is'omitted for the sake of clearness. It should also be noted that there is a slight out of scale difference between Figs. 5 and 6. The force of gravity on the carriage .Elis counteracted by springs 42. Each spring is attached at one end to the carriage 3? and at the other end to a bracket 53 fixed to one of the tracks 39.

Figs. 7 and 8 show another form of mounting for the carrier. Instead of running on rollers on a curved track as inFigures 5 and 6 the carrier is fixed to a bracket which in turn is pivotably mounted through pivot 45' on another bracket 55. which is fixed to the base plate of the.

machine. The pivot 45 is arranged to be mounted along the axis of ring 5 so that the carrier (25 and 26) reciprocates in a path concentrically with the path of the ring 5, being pulled down by the material being wound on the core. and being returned by the spring 4?. The amount of tension of'the spring All may be regulated by positioning one end in. any selected hole d8 in bracket Many other ways of adjusting this tension could be devised. Thecarrier is prevented from rising too high on itsreturn by means of the stop it in the path of bracket it. The carrier bracket lit-is fixed tothebracket it by means of a pivot 59 on which it can rotate. During the course of making a winding the coreand carrier have-to be rotated? It would be diflicult to do this di-' (traversed) rectly by hand since the carrier and core would be moving up and down ata fairly fast rate depending uponqthespeed of the machine. More- I over the movement of the carrier, necessary to minimise shock on the wire, would be impeded by its being held. So some kind of mechanism has to be devised to traverse the core about its axis without impeding its up and down motion, and at'the same time allow the operators hand to re main steadys; One possiblemeans of doing this is indicated in Fig. 7 and shown in plan in Fig. 9.

The hand wheel 5! joined to gear wheel 53 is rotatably mounted on bracket 52 fixed to the base of the machine. 1 Teeth on the gear ring mesh in with teeth on on hside of the curved rack 55. Rotationright or left of the hand wheel will move the rack 55 backwards and forwards on the guide rod 56. On the side of the curved rack 55 remote from-the-handwheel are further teeth which mesh in*=wi-th"teeth on gear wheel 5 3 this said gear E lbeing fixed to the jaw 25 of the core carrier. It will be seen that movement, of the handwheel moves the rack which in turn rotates the core carrier. But ,When the machine is in action the toothed rack has to be deep enough to prevent gear 54' coming out of-mesh and also curved con.- centrically with ring 5 so that gear 5 may remain in mesh while moving up and down. This avoids the reciprocating motion being transmitted to the operator's hand.

What is claimed-is: I 1. A toroidal coil winding machine having a winding ring rotatable in a circular path through an annular core for winding turns of wire on to said core comprising a carrier supporting said. core, a pivotal mounting for said carried ior, tilt-,

ing said core in the direction of rotation of said windingring, a resilient linkmember attached to said carried for normallyholding said core in a predetermined position and permitting a limited pivotal movement of said core in response to the,-

pull of the wire being wound thereon, a recess formed in said winding ring, and a spoolcontaining said wire positioned in said recess in frictional slldlng engagement with said ring, whereby the movement of the spool relative to said winding ring in response to thepull of Wire further minimizes the tension in the wire. 7

2. A machine. according to claim 1, further comprising a support for said carrier, a clam on said carrier for engaging said core, said resilientlink member being connected between said support and said carrier.

3. The machine according to claim 1 further Date Number Name 697,660 Pupin et -al l Apr. 15, nice 1,862,206 Tauchmann June '3, 1932 1,876,414 Harvey 11 Se'othd, 1932 1,879,882 Bullets; Sent. 27 1932 1,957,068 Kelman Ma 1: 193 2,171,119 Be1itsq Q i Aug.29 1935 2367.489 Dow d Jan. 16 1945 2,425,511 Gonklin 'Aug. 12 1947 2,433,112 Goddard Dec. 23, 1947 (FOREIGN PATENTS Number Country Date 264,677 Germany Sept. 26 1913 679,117 Fra ce. f Jan. 5: 1950 

